time is from 20 minutes back from mars but in reality once we decide what we're going to do we have a science operational working group. we decide what we're going to do and the sol is a martian day. we write the script. we program -- we write the program. that takes about six hours to write. and then it gets sent from the deep space network to mars where the rover picks it up and the rover does all of those operations during that day. it gets that information first thing in the morning and then it is with us all day long. you program an entire day in one sitting. >> i love that name. did you say deep mars network? >> deep space. reporting live from the deep space network. so that's interesting. why do a whole day's worth of instructions at one time? is it more efficient form the machine? does it -- >> there's always this 20-minute light delay. in writing the program writing the scripts it's called, takes a little bit of time to do. we have to get together and review things. doing it in real time is inefficient. the way the rover works is the rover always talks to an orbiter. we talk to an or